KVM: Synchronize guest physical memory map to host virtual memory map

Synchronize changes to host virtual addresses which are part of
a KVM memory slot to the KVM shadow mmu.  This allows pte operations
like swapping, page migration, and madvise() to transparently work
with KVM.

Signed-off-by: Andrea Arcangeli <andrea@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index bc34dc21f178..0f3c53114614 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -13,6 +13,7 @@
 
 #include <linux/types.h>
 #include <linux/mm.h>
+#include <linux/mmu_notifier.h>
 
 #include <linux/kvm.h>
 #include <linux/kvm_para.h>
@@ -251,6 +252,7 @@ struct kvm_vcpu_arch {
                 gfn_t gfn;      /* presumed gfn during guest pte update */
                 pfn_t pfn;      /* pfn corresponding to that gfn */
                 int largepage;
+                unsigned long mmu_seq;
         } update_pte;
 
         struct i387_fxsave_struct host_fx_image;
@@ -729,4 +731,8 @@ asmlinkage void kvm_handle_fault_on_reboot(void);
         KVM_EX_ENTRY " 666b, 667b \n\t" \
         ".popsection"
 
+#define KVM_ARCH_WANT_MMU_NOTIFIER
+int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
+int kvm_age_hva(struct kvm *kvm, unsigned long hva);
+
 #endif